Abstract

High-Frequency (HF) radars are operated in the 3-30 MHz frequency range
and have been used for several decades now. Sky-wave systems are able to
keep large areas under surveillance, e.g. the whole northern coast of Australia.
Some of these systems have caused severe interference to other radio services like the
Russian "Woodpecker". Currently, a network of ground-wave HF radars is beeing
installed along the US coast. Due to the large number of systems, they can no longer
be operated on an experimental license and care must be taken to avoid radio frequency
interference with other radio services and radars. This paper discusses different
modulation techniques for HF radar range resolution and their compatibility with other
users of the HF spectrum.
klaus-werner.gurgel@uni-hamburg.de